Darth Vader learned of this ability through Darth Sidious, and upon his death, the spirits of Kenobi and Yoda completed his training by granting him the last step in becoming a spirit. Anakin's spirit appeared as that of his younger self, prior to his fall to the dark side.

That conspicuously unsourced quote, wherever it is copied from, is NOT the "official story". Vader did not learn anything about the ability from Palpatine. It is a light side ability and Palpatine doesn't know it.

Darth_Kiryan said:

It is the general assumption that because he is the "Chosen One" he would automatically know how to do it.

According to Lucas that's not accurate; he was assisted by Obi-Wan/Yoda.

Actually, it is. Being lightsided, it is not the same power as the EU's "Sith spirits", which is why the quote refers to "similar techniques", not the same technique. Qui-Gon explains in the ROTS novel/script that Sith don't do it. Sith spirits tend to be bound to specific objects or locations while this is not true for Force ghosts.

Actually, it is. Being lightsided, it is not the same power as the EU's "Sith spirits", which is why the quote refers to "similar techniques", not the same technique. Qui-Gon explains in the ROTS novel/script that Sith don't do it. Sith spirits tend to be bound to specific objects or locations while this is not true for Force ghosts.

Darth Vader learned of this ability through Darth Sidious, and upon his death, the spirits of Kenobi and Yoda completed his training by granting him the last step in becoming a spirit. Anakin's spirit appeared as that of his younger self, prior to his fall to the dark side.

That conspicuously unsourced quote, wherever it is copied from, is NOT the "official story". Vader did not learn anything about the ability from Palpatine. It is a light side ability and Palpatine doesn't know it.

I don't have my copy on hand, but I am 99.8% sure that quote or something like it comes from the Complete Star Wars Encyclopedia.

Why was that tree cave haunted in the Empire Strikes Back? Was it haunted from an ancient sith that was there? Why didn't Sideous know about his own sith history? Sideous could have went there or found a way to communicate to the ancient sith to discover Yoda & Luke. Perhaps Sideous did know & allowed it to happen for reasons that we will not find out until later films.

Why was that tree cave haunted in the Empire Strikes Back? Was it haunted from an ancient sith that was there? Why didn't Sideous know about his own sith history? Sideous could have went there or found a way to communicate to the ancient sith to discover Yoda & Luke. Perhaps Sideous did know & allowed it to happen for reasons that we will not find out until later films.

Why was that tree cave haunted in the Empire Strikes Back? Was it haunted from an ancient sith that was there? Why didn't Sideous know about his own sith history? Sideous could have went there or found a way to communicate to the ancient sith to discover Yoda & Luke. Perhaps Sideous did know & allowed it to happen for reasons that we will not find out until later films.

Technically they are actually attached to their holocrons according to the legacy comics. Darth Kryat talks to them.

You can talk to holocron gatekeepers. That's part of the design; holocron gatekeepers are interactive. But that doesn't mean the holocron gatekeepers necessarily are the spirits of the people they represent. We followed Bane through the process of trying to create a holocron; we saw the circumstances of his death. At no point did he attach himself to his holocron or essence transfer into his holocron; he died attempting to essence transfer into Zannah, and his holocron was mostly not even in his possession after the point when he learned essence transfer.

You can talk to holocron gatekeepers. That's part of the design; holocron gatekeepers are interactive. But that doesn't mean the holocron gatekeepers necessarily are the spirits of the people they represent. We followed Bane through the process of trying to create a holocron; we saw the circumstances of his death. At no point did he attach himself to his holocron or essence transfer into his holocron; he died attempting to essence transfer into Zannah, and his holocron was not even in his possession after the point when he learned essence transfer.

True that. Very true.
Still though it would be a very interesting conception if it was him.

Technically they are actually attached to their holocrons according to the legacy comics. Darth Kryat talks to them.

You can talk to holocron gatekeepers. That's part of the design; holocron gatekeepers are interactive. But that doesn't mean the holocron gatekeepers necessarily are the spirits of the people they represent. We followed Bane through the process of trying to create a holocron; we saw the circumstances of his death. At no point did he attach himself to his holocron or essence transfer into his holocron; he died attempting to essence transfer into Zannah, and his holocron was not even in his possession after the point when he learned essence transfer.

Bane failed at transferring into Zannah, & Tenebrous failed at transferring into Plagueis, as well?

Why was that tree cave haunted in the Empire Strikes Back? Was it haunted from an ancient sith that was there? Why didn't Sideous know about his own sith history? Sideous could have went there or found a way to communicate to the ancient sith to discover Yoda & Luke. Perhaps Sideous did know & allowed it to happen for reasons that we will not find out until later films.

Why was that tree cave haunted in the Empire Strikes Back? Was it haunted from an ancient sith that was there? Why didn't Sideous know about his own sith history? Sideous could have went there or found a way to communicate to the ancient sith to discover Yoda & Luke. Perhaps Sideous did know & allowed it to happen for reasons that we will not find out until later films.